Reviewers: Michael Starzinger,

Message:
PTAL

Description:
[turbofan] Reduce memory consumption of graph building

Allow reservation of additional input capacity when creating nodes to prevent
switching to deque representation when adding well-known additional inputs.

Also ensure that only a single temporary buffer is used to create temporary
input arrays before allocating nodes.

Please review this at https://codereview.chromium.org/644083003/

Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge

Affected files (+103, -54 lines):
  M src/compiler/generic-node.h
  M src/compiler/generic-node-inl.h
  M src/compiler/graph.cc
  M src/compiler/graph-builder.h
  M src/compiler/graph-builder.cc
  M src/compiler/node.h
  M src/compiler/raw-machine-assembler.h
  M src/compiler/raw-machine-assembler.cc
  M test/cctest/compiler/graph-builder-tester.h
  M test/cctest/compiler/simplified-graph-builder.h
  M test/cctest/compiler/simplified-graph-builder.cc
  M test/unittests/compiler/value-numbering-reducer-unittest.cc


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